If enough air is forced out of the space between the two bodies as they approach sound can be made either directly (the displacement is the initiating event) or a secondary effect of that out-rushing air interacting with the edges of the bodies. This mechanism is rare enough in everyday life that I can't think of an example off the top of my head.

Paper produces louder sound and higher frequencies if we tear it faster; It is hard to tell which one produces louder sound, folded paper or single layer paper; Folded paper produces lower frequencies than single layer paper; Also, is it the same mechanism that explains the sound produced when we are cutting paper using a scissor?

2015年1月19日 · The wavelength of sound waves in a solid is much greater than the dimensions of atoms. For example the speed of sound in steel is 6100m/sec, so the note middle C (262Hz) has a wavelength of about 23 metres. Sound waves are collective motions of a vast number of atoms, and it isn't especially helpful to think of them as being generated by atom ...

2017年5月17日 · In general usage, "sound" refers to our perception of the vibrations of particles (atoms, molecules) in some medium, typically air or water, though sound waves can travel through any medium. Vibrations are produced whenever objects cause the particles in the medium to oscillate, e.g. clapping your hands together, beating a drum, or yelling.

Sound is defined as vibrations that travel through the air or another medium as an audible mechanical wave. It is produced from a vibrating body. The vibrating body causes the medium (water, air, etc.) around it to vibrate thus producing sound.

The comments above that say the sound is louder because the soundboard itself begins to vibrate are correct. This is called resonance. It sounds louder because the motion of the board is mechanically more efficient at converting the energy of the system into sound waves than the string alone. The board is an effective radiator of sound energy.

2018年7月20日 · Then, the speed of sound in the metal is given by $$ v_s = \sqrt{\frac{Y}{\rho_m}}, $$ where $\rho_m$ is the density of the metal. Sound is a longitudinal wave, meaning its oscillation is in the same direction as its motion. See the below gif. Connecting these, you can show that the speed of sound within the solid is

Thesound made by bees which are not carrying honey has. A. A lower pitch. B. A higher pitch. C. A smaller ...

2018年9月4日 · To be sound the pressure must be changing, and to be audible sound it must change at a frequency that's physiologically detectable by our ears, between 20 and 20,000 Hz. Secondly, by the law of averages , the variation in the energies of individual are molecules is insignificant because an eardrum is many orders of magnitude more massive.

2021年12月5日 · $\begingroup$ just found it by google "directed sound". I knew of the technology of using reflected sound in open air theaters and clubs ( I live in Greece) so that the sound does not propagate outside and disturb neighbors. Sound is modeled with wave equations, the same as light, so it makes sense that a beam can be constructed. $\endgroup$ –